What is the ceiling of a ship commonly called?

The ceiling of a ship is commonly referred to as the deckhead. This term specifically describes the overhead surface within a compartment, typically between the deck and the upper structures of a ship. Understanding this terminology is essential for effective communication among crew members, especially during training and emergency situations, where precise language is crucial.

The term "deck" typically refers to the floor surfaces on a ship rather than the ceiling. "Cabin" usually denotes enclosed spaces used for accommodation, and "sky" does not have a relevant connection to the structural components of a ship. Therefore, deckhead is the most accurate term to describe the ceiling, as it specifically delineates that part of the vessel's interior structure.